Unlike the majority of other Mario titles, Super Mario Bros. 2 was not developed from the ground up. Rather, it is a redesign of the Japanese Family Computer Disk System game "Yume Kōjō: Doki Doki Panikku" (夢工場 ドキドキパニック, lit. "Dream Factory: Heart-Pounding Panic"[3]). Nintendo's original sequel to Super Mario Bros. was released in Japan as Super Mario Bros. 2 in 1986; however, because of that game's difficulty and its close similarities to the original game, Nintendo decided not to release it in the West at that time. Because Super Mario Bros. 2 is a redesign of a non-Mario game, the game differs greatly from the original Super Mario Bros., though many elements from the game have since become part of the Mario series canon. The redesigned Western version of Super Mario Bros. 2was released in Japan in 1992 under the title Super Mario USA (スーパーマリオUSA Sūpā Mario Yū Esu Ē?), and in 1993 a 16-bit remake of the original Japanese version was released to the rest of the world as Super Mario Bros.: The Lost Levels as part of Super Mario All-Stars.